The Simple Pump hand-operated pump can work from as deep as 325 feet of static water level, and the motorized pump from 225 feet when pumping to ground level and to ambient pressure. These limits are then affected if you are also pumping into a pressurized plumbing system or uphill. Pumping to 45 psi in a pressure tank is equivalent to 100 feet of water, so the limits are then 225 feet for the hand pump and 125 feet for our motors.